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2. Webster, G.A. (1982) Methods of measuring crack growth at elevated temperatures, in Measurement of High Temperature Mechanical Properties of Materials, (eds M.S. Loveday, M.F. Day and B.F. Dyson ), HMSO, London.
3. Schwalbe, K.H. and Hellman, D. (1981) Application of the electrical potential method to crack length measurement using Johnsons formula. J. Test. Eval., 9, 218–221.
4. Klintworth, G.C. and Webster G.A. (1979) Optimisation of electrical potential methods of measuring crack growth. J. Strain Anal., 14, 187 – 192.
5. EGF PI-90 (1990) EGF recommendations for determining the fracture resistance of ductile materials, European Group on Fracture.